The discovery of non-thermal X-ray emission from Galactic
supernova remnants (SNRs) has generated a considerable
amount of interest in modern astrophysics from both
observational and theoretical perspectives. In particular,
such emission strongly suggests that the expanding shock
fronts of SNRs accelerate cosmic-ray particles to energies
that approach the "knee" of the observed cosmic-ray spectrum
at 3000 TeV. To investigate this phenomenon in more detail,
we have considered a SNR known to emit non-thermal X-rays,
G347.3-0.5, and we present a 45 kilosecond RXTE observation
of this source. G347.3-0.5 is a member of a class of SNRs
which are young, shell-type sources that emit X-rays from
specific regions on their outer shells. Our observation
samples the energy spectrum of G347.3-0.5 between 3 keV and
20 keV, and we have fitted the data with several different
models in order to analyze the underlying processes
responsible for this emission. We will present the results
of these fits and discuss their implications.

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